Malicious PDF — malware analysis report

Static analysis result for SHA-256 292cb7f58b05a1aa…

MALICIOUS

PDF

77.7 KB Created: 2021-09-08 21:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cf8d9f0349364be574d1656ac459ddac SHA-1: 95623bcc41ce3d11b1865a4a5c7860ad7399e192 SHA-256: 292cb7f58b05a1aa364313812ee46a76e0fefb82900f3860dbc3c51245a6d3bd
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this PDF is part of a link farm, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.alitec.es/js/ckfinder/userfiles/files/makoresesitabexekinavo.pdf In PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/38676247459.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/76030154208.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/jabamoxumujuruwedel.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/zapim.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/eci66qico3unnvt3q8g6q1ln8l/sotoli.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/kokomerevotalax.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/75208825335.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/7951103668.pdfIn PDF document text
    • http://cochemical.com/upload/files/68946400255.pdfIn PDF document text
    • https://kvzriu.org/images/file/kusumukobosa.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0a0dc0b73---18719295665.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/44176954031.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/zunesukinubijisokulaxaji.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210902142241.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/32718639697.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210902212453.pdfIn PDF document text
    • https://hse.tw/upload/file/fosalesege.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/muvatonafuwoneted.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/74786891965.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210903101805.pdfIn PDF document text
    • http://contua.org/userfiles/file/93968313494.pdfIn PDF document text
    • http://17njl.com/userfiles/files/woxudunidubatiwa.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/pobad.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/14462576459.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=a105f+flash+filePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE750 16544 bytes
SHA-256: 6ee569092572c07fc1513f4a57730f6290b1de6323b932015880dec83c4d6731
font_02_sfnt_off0001123f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123F 10176 bytes
SHA-256: d5642ab24458b6938f5042247dfd814c25092c0fcc590d7b0b0cca4ff8ab655e